Haven't watched the replay yet, but my dad texted me during the game and said the place looked empty. I told him lots of people in black and even from my seats I could see how you could think there were a lot of empty seats because of the white/orange mixed in with the crowd gave the appearance of mostly empty areas. For me the other side of the stadium was tough to make out the crowd with the way the lights are.
He is old (almost 80) so take it for what it's worth.